Carrier 48ES---A Instruction Manual download pdf (Page 35)

g.Reinstallbloweraccesspanel(seeFig.19).

3. Restore electrical power to unit. Start unit and check for

proper blower rotation and motor speeds during heating and

cooling cycles.

Induced Draft (combustion air) Blower Assembly

The induced-draft blower assembly consists of the inducer motor,

the blower housing, and the induced-draft blower wheel.

Clean periodically to assure proper airflow and heating efficiency.

Inspect blower wheel every fall and periodically during the heating

season. For the first heating season, inspect blower wheel

bimonthly to detem_ine proper cleaning frequency.

To inspect blower wheel, remove draft hood assembly. Shine a

flashlight into opening to inspect wheel. If cleaning is required,

remove induced-draft blower assembly as follows:

1. Remove control access panel (See Fig. 19).

2. Remove the 5 screws that attach induced-draft blower as-

sembly to the flue collector box cover.

3. Slide the assembly out of the unit. (See Fig. 20). Clean the

blower wheel. If additional cleaning is required, continue

with Steps 4 and 5.

4. To remove blower wheel, remove 2 setscrews.

5. To remove inducer motor, remove screws that hold the

inducer motor to the blower housing.

6. To reinstall, reverse the procedure outlined above.

Flue Gas Passageways

To inspect the flue collector box and upper areas of the heat

exchanger:

1. Remove the induced draft blower assembly according to

directions in the Induced Draft Blower Assembly section.

2. Remove the 11 screws holding the flue collector box cover

(See Fig. 18) to the heat exchanger assembly. Inspect the

heat exchangers.

3. Clean all surfaces, as required, using a wire brush.

Integrated

Gas Unit

ntrolter

(IGC)

Auto Transformer

fuses used on 460

(Hidden)

Inte_ace Fan

Board (IFB)

_lnduced Draft

Motor

BLOWER

ACCESS

COMPRESSOR

PANEL

ACCESS PANEL

Fig. 19 - Unit Access Panels

Limit Switch

CONTROL

ACCESS

PANEL

A09207

Remove blower access panel (see Fig. 19). Limit switch is located

on the fan partition.

Burner Ignition

Unit is equipped with a direct spark ignition 100 percent lockout

system. Ignition module (IGC) is located in the control box (See

Fig. 18). Module contains a self-diagnostic LED. During

servicing, refer to label diagram or Table 5 in these instructions for

LED interpretation.

If lockout occurs, unit may be reset by either momentarily

interrupting power supply to unit or by turning selector switch to

OFF position at the thermostat.

Main Burners

At the beginning of each heating season, inspect for deterioration

or blockage due to corrosion or other causes, Observe the main

burner flames and adjust, if necessary,

Fan Partition

Mounting

Bracket

Flue Rollout

Collector Inducer Burner Mounting Switch

Box Blower Rack Screw

Housing

Fig. 18 - Blower Housing and Flue Collector Box

A09193

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Carrier 48ES---A Instruction Manual Page 35

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